no Report of the Botanist of the 



fungus, C. roscuiii, and the decay caused by this new fungus there 

 are some differences in gross appearance by which they can be 

 distinguished. On fruit affected with C. roscuin there is usually 

 a conspicious white or pinkish growth of the fungus in the center 

 of an affected spot; whereas this new fungus does not show at 

 all conspiciously on the surface of a decayed spot until made to 

 do so by artificial conditions. On fruit, C. roscum is a very 

 shallow growing fungus, penetrating the tissue not much more 

 than an eighth of an inch, while this new fungus grows much 

 deeper and in its late stage extends to the core. The tissue 

 decayed by C. roseuni has a very characteristic and decidely bitter 

 taste, but the tissue decayed by this other fungus is only slightly 

 bitter. 



The scantiness of the fruiting of the fungvis both on affected 

 apples and in pure cultures was very remarkable. On one of the 

 diseased specimens first received there were found a few spores, 

 but for some time afterward affected apples that were put in 

 moist chambers refused to develop any spores of the fungus. 

 In the greater number of the cultures made, using several 

 different media, the fungus would not fruit, though there would 

 develop an abundance of the mycelium. But late in April, several 

 cultures made from diseased tissue from artificially inoculated 

 apples produced spores in abundance, and about this time affected 

 apples that had been placed in moist chambers also fruited. 



A microscopic examination will at once show that the fungus 

 associated with this decay is entirely dift'erent from C. roscmn. 

 As seen under a microscope the most prominent and striking- 

 thing about the fungus is the constant presence of clamp con- 

 nections at each septum of the hyphae (Plate IV, Fig. 2). This 

 character will be found very useful in identifying the fungus. As 

 these clamp connections were known to occur chiefly on species 

 of the Basidiomyc2tes — a class of fungi including the rusts, 

 smuts, mushrooms and puff balls — to find them on a fungus 

 causing a decay of apples was very unusual. 



While we were engaged in making drawings of the fungus and 

 attempting to classify it, specimens were shown to Mr. H. Hassel- 

 bring, who happened in the laboratory. Mr. Hasselbring 

 expressed the opinion that it was a species of Hypochnus. Subse- 



